involving the poison ricin. one letter was sent topresidentobama. anotherto a u.s. senator. this morning a suspicious package trigger add lockdown on capitol hill. scott mcfarland joins us now with word the lockdown has now been lifted. scott? >> reporter: just a short while ago, janet, not just a suspicious package but two suspicious letters tested as well, -- letters as well, all tested, all cleared. police officers and explosive sniffing dogs outside and inside the entrances on capitol hill. you can also see a hazardous materials truck there. lights flashing near the u.s. senate russell building. the third floor of the building locked down for a while today, including a hallway with the offices of pennsylvania democratic senator bob casey. >> there was a letter on this floor that was delivered that apparently is no longer a concern about, but in the interest of being careful, they shut down a corridor. >> reporter: in the past 24 hours, two other letters have reportedly tested positive for a poison called ricin, one addressed to president owe bam. another -- president obama, another t